feat(eventstore): increase parallel write capabilities (#5940)

This implementation increases parallel write capabilities of the eventstore.
Please have a look at the technical advisories: [05](https://zitadel.com/docs/support/advisory/a10005) and  [06](https://zitadel.com/docs/support/advisory/a10006).
The implementation of eventstore.push is rewritten and stored events are migrated to a new table `eventstore.events2`.
If you are using cockroach: make sure that the database user of ZITADEL has `VIEWACTIVITY` grant. This is used to query events.

cmd/setup/14/postgres/02_create_and_fill_events2.sql

@@ -0,0 +1,31 @@
+CREATE TABLE eventstore.events2 (
+    instance_id,
+    aggregate_type,
+    aggregate_id,
+    
+    event_type,
+    "sequence",
+    revision,
+    created_at,
+    payload,
+    creator,
+    "owner",
+    
+    "position",
+    in_tx_order
+) AS SELECT
+    instance_id,
+    aggregate_type,
+    aggregate_id,
+
+    event_type,
+    event_sequence,
+    substr(aggregate_version, 2)::SMALLINT,
+    creation_date,
+    event_data,
+    editor_user,
+    resource_owner,
+
+    EXTRACT(EPOCH FROM creation_date),
+    event_sequence
+FROM eventstore.events_old;